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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 3.1 Cohort studies secondary cases | 1 | Risk Ratio (IV, Random, 95% CI) | Subtotals only | |
| 3.1.1 Any strain | 1 | Risk Ratio (IV, Random, 95% CI) | 0.11 [0.03, 0.42] |
